refactor: use the istioctl wrapper for installing the control plane #739

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Unit Test (pilot)	24s
Run Tests / Unit Test (gateway)	27s
Run Tests / Lint Code (pilot)	20s
Run Tests / Integration Test (1.25-strict/stable, integration)	5m 36s
Run Tests / Lint Code (gateway)	27s
Run Tests / Integration Test (1.25-strict/stable, integration-tls)	5m 50s
Run Tests / Observability Integration Test (1.25-strict/stable)	5m 34s
Run Tests / Integration Test (1.26-strict/stable, integration)	5m 45s
Run Tests / Observability Integration Test (1.26-strict/stable)	5m 28s
Run Tests / Integration Test (1.26-strict/stable, integration-tls)	5m 50s
Run Tests / Check libraries (istio-gateway) / Check libraries	3s
Run Tests / Check libraries (istio-gateway) / Lint	10s
Run Tests / Check libraries (istio-pilot) / Check libraries	31s
Run Tests / Check libraries (istio-pilot) / Lint	10s
Publish Charm / Publish Charm (./charms/istio-gateway)	3m 29s
Publish Charm / Publish Charm (./charms/istio-pilot)	26m 31s
	1h 6m 38s

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